Hi Chris,
Sorry for this problem and thanks for your feedback!
[b]for your question:[/b]
- We made a mistake in uploading the firmware and it leads to the problem you found.We will update the wiki to let you and other customers know how to solve this problem.
2.We will upload the source code soon.If you want it now, please share me your email address. If you find any other problem, please notify us. Thanks! 
3.There is a register(addr: 0X08) which is used for setting the I2C address. But it will be reset as 0X4B if the cape restarted( after you wrote one byte address into 0X08, you should change your I2C address and do not reset the cape). I have reviewed the source code and find that it will come into conflict with some commands.This has been solved in latest version.